Lactoperoxidase

Lactoperoxidase (LPO) catalyzes the oxidation of thiocyanate, bromide and iodide using hydrogen peroxide. The short-lived oxidized intermediates of the reaction serve as potent bactericidal agents. LPO is used as an antimicrobial agent in milk and its products, in cosmetics, toothpaste and ophthalmic solutions. LPO is the second most abundant enzyme in milk. Heme is the cofactor of LPO. LPO contains a strongly-chelated calcium ion.

3D structures of lactoperoxidase3D structures of lactoperoxidase

Lactoperoxidase binary complex

2pt3 - bPLO + phosphate - bovine
2r5l – gLPO + I – goat
3nak – gLPO + formate

Lactoperoxidase ternary complex

2gj1 – bLPO + carbonate + nitrate
2ips, 3eri, 3gc1 – bLPO + SCN + I
2qrb – bLPO + SCN + Cl
3bxi – bLPO + SCN + nitrate
2pum – bPLO + catechol + I
2gj1 – bLPO + carbonate + nitrate
3krq – bLPO + amino-triazole + I
2z5z – wbPLO + F + I – water buffalo
2o86 – wbPLO + nitrate + I
3erh - wbLPO + SCN + I
2ojv – gPLO + CN + I
3n8f - gLPO + SCN + nitrate
3niu – gLPO + diethylene glycol + phosphate
3rke - gPLO + inhibitor + I
2ikc – sLPO + carbonate + formate – sheep

Lactoperoxidase quaternary complex

3gcj, 2qpk - bPLO + salicylhydroxamic acid + SCN + I
3gck - bPLO + benzylhydroxamic acid + SCN + I
3uba - bPLO + hydroxycinnamic acid + SCN + I
3gcl, 2qqt - bPLO + aspirin + SCN + I
3i6n - bPLO + isoniazid + SCN + I
3nyh - bPLO + Br + Cl + SCN + I
3ogw - bPLO + indomethacin + SCN + I
3py4 - bPLO + paracetamol + SCN + I
3q9k - bPLO + phenyliso-SCN + SCN + I
3ql6 - bPLO + nitro-phenoxymethanesulfonanilide+ SCN + I
3s4f - bPLO + pyridine derivative + SCN + I
3r4x, 3tuw - bPLO + pyrazine derivative + SCN + I
3r5o - bPLO + methoxyphenol + SCN + I
3tgy - bPLO + ascorbate + SCN + I
3v6q - bPLO + CO + SCN + I
2gjm - wbPLO + carbonate + SCN + I
3faq – wbLPO + CN + SCN + I
3fnl - wbPLO + salicylhydroxamic acid + SCN + I
2e9e – gPLO + nitrate + carbonate + SCN + CN
2efb – gPLO + phosphate + carbonate + SCN + CN
3qf1 - gPLO + piperazine + SCN + I
2eha – gPLO + formate + carbonate + SCN
3r55 - gPLO + pyrazine derivative + SCN + I
3sxv - gPLO + amitrole + SCN + I
3r5q - sPLO +tetrahydrofuran + SCN + I